[NTG-context] Convert tif to jpg (instead of pdf)

Hi, According to the documentation, it is possible to automatically convert TIFF images to a format supported by LMTX via GraphicsMagick. https://wiki.contextgarden.net/Using_Graphics#Image_Conversion However, by default this produces pdf files which are quite huge. is it possible to instruct grapichsmagick to convert tiff images to jpg instead of to pdf ? There's an example on the linked page in the documentation, but I have to admit that I don't quite understand what I should do... Best Denis